David McCullough was encouraged by the success of his first book, The Johnstown Flood, but he was still faced with a difficult decision, to trade a steady and satisfying job for the insecurities of life as a full-time writer with a growing family to support. With his wife's encouragement, he took the plunge and has never looked back. Today he is a best-selling author, and one of America's most distinguished historians. He has received not one but two Pulitzer Prizes, for John Adams...